diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index e7dc81a803..a4e9ed72b1 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -53,6 +53,7 @@ class LChunkBuilder;
 
 
 #define HYDROGEN_ABSTRACT_INSTRUCTION_LIST(V)  \
+  V(BinaryOperation)                           \
   V(BitwiseBinaryOperation)                    \
   V(ControlInstruction)                        \
   V(Instruction)                               \
@@ -2677,6 +2678,8 @@ class HBinaryOperation: public HTemplateInstruction<3> {
   virtual bool IsCommutative() const { return false; }
 
   virtual void PrintDataTo(StringStream* stream);
+
+  DECLARE_ABSTRACT_INSTRUCTION(BinaryOperation)
 };
 
 
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 8e9fe00034..1afa6603aa 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -3567,7 +3567,10 @@ class BoundsCheckBbData: public ZoneObject {
        HConstant(new_offset, Representation::Integer32());
     if (*add == NULL) {
       new_constant->InsertBefore(check);
-      *add = new(BasicBlock()->zone()) HAdd(NULL,
+      // Because of the bounds checks elimination algorithm, the index is always
+      // an HAdd or an HSub here, so we can safely cast to an HBinaryOperation.
+      HValue* context = HBinaryOperation::cast(check->index())->context();
+      *add = new(BasicBlock()->zone()) HAdd(context,
                                             original_value,
                                             new_constant);
       (*add)->AssumeRepresentation(representation);